disk2png

Create a PNG image from a disk image (or basically any file).

Usage

disk2png inFile outFile.png [blockSize level]

inFile : file name of the disk image

outFile.png : file name of the output PNG image

blockSize : optional size of one block (column in the PNG image), default = 1024

level : optional output level see Output level section, default = b (small)

The command line parsing is quite naive for now, if you want to set the level you have to include a blockSize.

Output level

The disk2png program can generate output PNG files with different levels. Small b and large B

b output

Every pixel in the resulting image corresponds to one byte in the source file. The pixel colour represents the value of the byte:

• blue pixels for bytes 0x01 to 0x19
• green pixels for classic readable text 0x20 to 0x7f
• red pixels are bytes 0x80 and above

Example for exfat.img:

B output

Every pixel represents eight bytes from the source disk image. The brightness value represents the number of non-zero bytes (so black for 8 zero bytes, almost white for 8 non-zero bytes)

Example for exfat.img:

Warning

This is a direct rewrite from a really ancient PHP script I wrote decades ago, so it is quire suboptimal and probably unsafe :-) It may crash, do something, you don't want, use with caution.

ToDo (someday maybe)

• "sanitize" and code clean up
• check with valgrind
• ability to create more "rows" (probably makes sense only for B output)
• borders and padding
• in-image label
• maybe multi-threading